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Kaolin Clay
Kaolinite ( ) is a clay mineral, with the chemical composition Al2 Si2 O5( OH)4. It is an important industrial mineral. It is a layered silicate mineral, with one tetrahedral sheet of silica () linked through oxygen atoms to one octahedral sheet of alumina () octahedra. Rocks that are rich in kaolinite are known as kaolin () or china clay. Kaolin is occasionally referred to by the antiquated term lithomarge, from the Ancient Greek ''litho-'' and Latin ''marga'', meaning 'stone of marl'. Presently the name lithomarge can refer to a compacted, massive form of kaolin. The name ''kaolin'' is derived from Gaoling (), a Chinese village near Jingdezhen in southeastern China's Jiangxi Province. The name entered English in 1727 from the French version of the word: , following François Xavier d'Entrecolles's reports on the making of Jingdezhen porcelain. Kaolinite has a low shrink–swell capacity and a low cation-exchange capacity (1–15 meq/100 g). It is a soft, earthy, usu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Phyllosilicates
Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust. In mineralogy, silica (silicon dioxide, ) is usually considered a silicate mineral. Silica is found in nature as the mineral quartz, and its polymorphs. On Earth, a wide variety of silicate minerals occur in an even wider range of combinations as a result of the processes that have been forming and re-working the crust for billions of years. These processes include partial melting, crystallization, fractionation, metamorphism, weathering, and diagenesis. Living organisms also contribute to this geologic cycle. For example, a type of plankton known as diatoms construct their exoskeletons ("frustules") from silica extracted from seawater. The frustules of dead diatoms are a major constituent of deep ocean sediment, and of diatomaceous earth. General structure A silicate mineral is generally an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Octahedron
In geometry, an octahedron (plural: octahedra, octahedrons) is a polyhedron with eight faces. The term is most commonly used to refer to the regular octahedron, a Platonic solid composed of eight equilateral triangles, four of which meet at each vertex. A regular octahedron is the dual polyhedron of a cube. It is a rectified tetrahedron. It is a square bipyramid in any of three orthogonal orientations. It is also a triangular antiprism in any of four orientations. An octahedron is the three-dimensional case of the more general concept of a cross polytope. A regular octahedron is a 3-ball in the Manhattan () metric. Regular octahedron Dimensions If the edge length of a regular octahedron is ''a'', the radius of a circumscribed sphere (one that touches the octahedron at all vertices) is :r_u = \frac a \approx 0.707 \cdot a and the radius of an inscribed sphere (tangent to each of the octahedron's faces) is :r_i = \frac a \approx 0.408\cdot a while the midradius, which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Feldspar
Feldspars are a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, potassium, or barium. The most common members of the feldspar group are the ''plagioclase'' (sodium-calcium) feldspars and the ''alkali'' (potassium-sodium) feldspars. Feldspars make up about 60% of the Earth's crust, and 41% of the Earth's continental crust by weight. Feldspars crystalize from magma as both intrusive and extrusive igneous rocks and are also present in many types of metamorphic rock. Rock formed almost entirely of calcic plagioclase feldspar is known as anorthosite. Feldspars are also found in many types of sedimentary rocks. Compositions The feldspar group of minerals consists of tectosilicates, silicate minerals in which silicon ions are linked by shared oxygen ions to form a three-dimensional network. Compositions of major elements in common feldspars can be expressed in terms of three endmembers: * potassium feldspar (K-spar) ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aluminium Silicate
Aluminium silicate (or aluminum silicate) is a name commonly applied to chemical compounds which are derived from aluminium oxide, Al2O3 and silicon dioxide, SiO2 which may be anhydrous or hydrated, naturally occurring as minerals or synthetic. Their chemical formulae are often expressed as xAl2O3·ySiO2·zH2O. It is known as E number E559. Examples * Al2SiO5, (Al2O3·SiO2), which occurs naturally as the minerals andalusite, kyanite and sillimanite which have different crystal structures. * Al2Si2O5(OH)4, (Al2O3·2SiO2·2H2O), which occurs naturally as the mineral kaolinite and is also called aluminium silicate dihydrate.Handbook of Inorganic Compounds, Dale L. Perry, Taylor & Francis, 2011, It is a fine white powder and is used as a filler in paper and rubber and also used in paints. * Al2Si2O7, (Al2O3·2SiO2), called metakaolinite, formed from kaolin by heating at . * Al6Si2O13, (3Al2O3·2SiO2), the mineral mullite, the only thermodynamically stable intermediate phase in t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay particles, but become hard, brittle and non–plastic upon drying or firing. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clay is the oldest known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been dated to around 14,000 BC, and clay tablets were the first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering. Between one-half and two-thirds of the world's population live or work in buildings made with clay, often ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cation-exchange Capacity
Cation-exchange capacity (CEC) is a measure of how many cations can be retained on soil particle surfaces. Negative charges on the surfaces of soil particles bind positively-charged atoms or molecules (cations), but allow these to exchange with other positively charged particles in the surrounding soil water. This is one of the ways that solid materials in soil alter the chemistry of the soil. CEC affects many aspects of soil chemistry, and is used as a measure of soil fertility, as it indicates the capacity of the soil to retain several nutrients (e.g. K+, NH4+, Ca2+) in plant-available form. It also indicates the capacity to retain pollutant cations (e.g. Pb2+). Definition and principles Cation-exchange capacity is defined as the amount of positive charge that can be exchanged per mass of soil, usually measured in cmolc/kg. Some texts use the older, equivalent units me/100g or meq/100g. CEC is measured in moles of electric charge, so a cation-exchange capacity of 10 cmolc/kg coul ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shrink–swell Capacity
The shrink–swell capacity of soils refers to the extent certain clay minerals will expand when wet and retract when dry. Soil with a high shrink–swell capacity is problematic and is known as shrink–swell soil, or expansive soil. The amount of certain clay minerals that are present, such as montmorillonite and smectite, directly affects the shrink-swell capacity of soil. This ability to drastically change volume can cause damage to existing structures, such as cracks in foundations or the walls of swimming pools. Description Due to the physical and chemical properties of some claysNagel, David. "Soil Science for Vegetable Producers." MSU: Coordinated Access to the Research and Extension System. 2001. Mississippi State U. 6 July 2008 http://msucares.com/pubs/publications/p1977.htm. (such as the Lias Group) large swelling occurs when water is absorbed. Conversely when the water dries up these clays contract (shrink). The presence of these clay minerals is what allows soils to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jingdezhen Porcelain
Jingdezhen porcelain () is Chinese ceramics, Chinese porcelain produced in or near Jingdezhen in Jiangxi province in southern China. Jingdezhen may have produced pottery as early as the sixth century CE, though it is named after the reign name of Emperor Zhenzong, in whose reign it became a major kiln site, around 1004. By the 14th century it had become the largest centre of production of Chinese porcelain, which it has remained, increasing its dominance in subsequent centuries. From the Ming dynasty, Ming period onwards, official kilns in Jingdezhen were controlled by the emperor, making imperial porcelain in large quantity for the court and the emperor to give as gifts. Although apparently an unpromising location for potteries, being a remote town in a hilly region, Jingdezhen is close to the best quality deposits of petuntse, or porcelain stone, in China, as well as being surrounded by forests, mostly of pine, providing wood for the kilns. It also has a river leading to rive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
François Xavier D'Entrecolles
François Xavier d'Entrecolles (1664 in Lyon – 1741 in Beijing; Chinese name: 殷弘绪, Yin Hongxu) was a French Jesuit priest, who learned the Chinese technique of manufacturing porcelain through his investigations in China at Jingdezhen with the help of Chinese Catholic converts between 1712 and 1722, during the rule of the Kangxi Emperor.McCabe, p.220''ff'' His observations were published in a long letter in 1712, and carefully studied in several European countries, even though Meissen porcelain was already making hard-paste porcelain in Germany by then. The letter's author was given as Père d'Entrecolles ("Father d'Entrecolles"), and he is still very often referred to as this. Religious career D'Entrecolles entered the Society of Jesus in 1682. He arrived in China in 1698 to become a member of the Jesuit China missions. Initially proselytizing in Jiangxi, he then became Superior General of the French Jesuits in China from 1706 to 1719. D'Entrecolles was then Superior of th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
New Georgia Encyclopedia
The ''New Georgia Encyclopedia'' (NGE) is a web-based encyclopedia containing over 2,000 articles about the state of Georgia. It is a program of Georgia Humanities (GH), in partnership with the University of Georgia Press, the University System of Georgia/Georgia Library Learning Online (GALILEO), and the Office of the Governor. The NGE was launched in 2004. It was the first state encyclopedia to be conceived and designed exclusively for publication online. The idea for the project grew out of the 1996 joint publication of ''The New Georgia Guide'' by the Georgia Humanities Council and the University of Georgia Press. The guide, itself a spiritual successor to the New Deal-era American Guide Series, was a literary success. Georgia Humanities and UGA Press then convinced Governor Zell Miller, who commissioned the guide in the first place, to fund the planning and development of a comprehensive print and online state encyclopedia. The name "New Georgia Encyclopedia" was chosen as a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jiangxi
Jiangxi (; ; formerly romanized as Kiangsi or Chianghsi) is a landlocked province in the east of the People's Republic of China. Its major cities include Nanchang and Jiujiang. Spanning from the banks of the Yangtze river in the north into hillier areas in the south and east, it shares a border with Anhui to the north, Zhejiang to the northeast, Fujian to the east, Guangdong to the south, Hunan to the west, and Hubei to the northwest. The name "Jiangxi" is derived from the circuit administrated under the Tang dynasty in 733, Jiangnanxidao (; Gan: Kongnomsitau). The abbreviation for Jiangxi is "" (; Gan: Gōm), for the Gan River which runs across from the south to the north and flows into the Yangtze River. Jiangxi is also alternately called ''Ganpo Dadi'' () which literally means the "Great Land of Gan and Po". After the fall of the Qing dynasty, Jiangxi became one of the earliest bases for the Communists and many peasants were recruited to join the growing people's ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jingdezhen
Jingdezhen is a prefecture-level city, in northeastern Jiangxi province, with a total population of 1,669,057 (2018), bordering Anhui to the north. It is known as the "Porcelain Capital" because it has been producing Chinese ceramics for at least 1,000 years, and for much of that period Jingdezhen porcelain was the most important and finest quality in China. The city has a well-documented history that stretches back over 2,000 years. History Throughout both the Spring and Autumn Period and the Warring States Period, the area of present-day Jingdezhen belonged to the Chu State. After the fall of the Chu, the area was incorporated into the Qin Dynasty as part of Fan County () in . Under the Han Dynasty, the area belonged to Poyang County () in . Under the Han Dynasty, the particular area of future Jingdezhen was known as Xinping (). Historical records show that it was during this time that it began to make porcelain. The town was established during the Jin Dynasty under the n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
